CN104977479B - Three-phase electricity condition detection apparatus, method and electric system - Google Patents

Three-phase electricity condition detection apparatus, method and electric system Download PDF

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Publication number
CN104977479B
CN104977479B CN201410148986.7A CN201410148986A CN104977479B CN 104977479 B CN104977479 B CN 104977479B CN 201410148986 A CN201410148986 A CN 201410148986A CN 104977479 B CN104977479 B CN 104977479B
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pulse signal
phase
threshold
pulsewidth
pulse
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CN104977479A (en
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戴训江
邓超
赵志刚
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Copeland LP
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Emerson Climate Technologies Inc
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Abstract

A kind of three-phase electricity condition detection apparatus, method and electric system are provided.Detection means includes pulse generation circuit, and it is respectively according to the first and second of three-phase electricity the first alternate line voltages, and the 3rd and second the second alternate line voltage, to generate the first and second pulse signals.When the first line voltage is higher or lower than predetermined voltage threshold, the first pulse signal is in the first or second state, and when the second line voltage is higher or lower than predetermined voltage threshold, the second pulse signal is in the third state or the 4th state.Detection means also includes detection unit, and it works according to the situation that three-phase electricity is detected than value-based algorithm than value-based algorithm according at least one following aspects：The relativeness in the cycle of phase difference and the first or second pulse signal between the relativeness of the pulsewidth of the first and second pulse signals, and the first and second pulse signals.Wherein, the low frequency detection algorithm for being adapted to detect for the situation of low frequency three-phase electricity is also included in detection means and method.

Description

Three-phase electricity condition detection apparatus, method and electric system
Technical field
Present disclose relates generally to three phase electric machine protection, more particularly to a kind of detection dress for being used to detect the situation of three-phase electricity Put, detection method, and the electric system using the detection means.
Background technology
Caused by motor damage is run under improper three-phase electricity situation mainly due to motor.Improper three-phase electricity situation Mainly include：Machine winding disconnects connection line between caused phase shortage, three-phase alternating-current supply and motor terminal and disconnected in itself draws The phase shortage risen, and the phase shortage or anti-phase occurred in each phase line of AC power.Motor operation protection is carried out, then is needed accurately simultaneously In time to it is above-mentioned several the occurrence of detect.
In the electric system with frequency converter, frequency converter can provide the protection to motor, including during instant cut-off Control, stalling protection, frequency detecting, failure is restarted, over torque detects and other types of hardware protection.But many feelings Under condition, frequency converter detection in itself and defencive function are insufficient for demand of the user to electric system security.Need to arrange Extra detection module detects three-phase electricity situation, to strengthen the protection to motor.
In a kind of known arrangement, detection module detects the analog voltage that frequency converter exports using partial pressure sensing circuit. The situation of three-phase electricity is determined based on the rms voltage of detected analog voltage and the measured value of frequency.It is determined that three Mutually electric situation is abnormal, such as phase shortage or it is anti-phase in the case of, output control signal, to the three-phase contactor in frequency converter downstream Conducting and disconnection are controlled, to realize the protection to motor.
The mode that the accuracy of measurement of known arrangement and measuring carries out protection act after abnormal condition needs into one Step is improved.
The content of the invention
According to an aspect of this disclosure, there is provided a kind of detection means for being used to detect the situation of three-phase electricity.The detection fills Put including：Pulse generation circuit, it is configured as according to alternate the first line voltage generation first of the first phase of three-phase electricity and second Pulse signal, and the second pulse signal is generated according to the second alternate line voltage of the third phase of three-phase electricity and second, wherein when First line voltage is respectively that the first pulse signal is respectively at first state and the second shape when being higher or lower than predetermined voltage threshold State, when the second line voltage be respectively be higher or lower than predetermined voltage threshold when, the second pulse signal be respectively at the third state with 4th state.The detection means also includes：Detection unit, it is configured as detecting the situation of three-phase electricity according to than value-based algorithm.Than Value-based algorithm works according at least one of following aspects：The relativeness of the pulsewidth of first pulse signal and the second pulse signal, And the first phase difference and the cycle of the first pulse signal or the second pulse signal between pulse signal and the second pulse signal Relativeness.
According to one embodiment of the disclosure, the relativeness of pulsewidth can be characterized by peak pulse duration.
According to one embodiment of the disclosure, phase difference and the relativeness in cycle can pass through mutually all ratios, i.e., described phase Potential difference characterizes with first pulse signal or the ratio in the cycle of second pulse signal.
Or one embodiment according to the disclosure, the relativeness of pulsewidth can be characterized by peak pulse duration, and phase Potential difference and the relativeness in cycle can pass through mutually all ratios, i.e. phase difference and the cycle of the first pulse signal or the second pulse signal Ratio characterize.
According to another embodiment of the disclosure, detection unit can be configured to：In the first pulse signal and The frequency of second pulse signal is less than frequency threshold, and the pulsewidth of the first pulse signal and the second pulse signal is both greater than equal to During pulse width threshold, detected according to than value-based algorithm.
According to another embodiment of the disclosure, according to than value-based algorithm, when peak pulse duration is less than first threshold Th1, detection Unit can determine the first phase or third phase phase shortage in three-phase electricity.
According to another embodiment of the disclosure, according to than value-based algorithm, when peak pulse duration is more than or equal to first threshold Th1, and Mutually all ratios are fallen into（0, Th2）Or（Th3,Th4）When middle, detection unit can determine three-phase electric power open phase, wherein Th2, Th3 and Th4 It is second, third and the 4th threshold value respectively, wherein, 0<Th2<Th3<Th4.
According to another embodiment of the disclosure, according to than value-based algorithm, when peak pulse duration is more than or equal to first threshold Th1, and Mutually all ratios are fallen into（Th5,Th6）When middle, it is anti-phase that detection unit can determine that three-phase electricity is present, wherein, Th5 and Th6 are the 5th thresholds Value and the 6th threshold value, wherein, Th2<Th5<Th6<Th3.
According to another embodiment of the disclosure, according to than value-based algorithm, when peak pulse duration is more than or equal to first threshold Th1, and When mutually week is than falling into other scopes, detection unit can determine that the situation of three-phase electricity is normal.
According to another embodiment of the disclosure, detection unit can be further configured in the first pulse signal and The frequency of two pulse signals is less than frequency threshold, and the pulsewidth of the first pulse signal and the second pulse signal is both less than pulsewidth threshold During value, determine that three-phase is electrically turn off.
According to another embodiment of the disclosure, detection unit can be further configured in the first pulse signal and The frequency of two pulse signals is less than frequency threshold, and one of the first pulse signal and the second pulse signal be less than pulse width threshold and When another pulsewidth is more than or equal to pulse width threshold, the situation for determining three-phase electricity is single-phase electricity phase shortage.
According to another aspect of the disclosure, there is provided a kind of detection method for being used to detect the situation of three-phase electricity, including：Root The first pulse signal, and the third phase according to three-phase electricity are generated according to the first alternate line voltage of the first phase of three-phase electricity and second Second line voltage alternate with second generates the second pulse signal, wherein when the first line voltage is respectively higher or lower than predetermined electricity When pressing threshold value, the first pulse signal is respectively at first state and the second state, when the second line voltage is respectively to be higher or lower than During predetermined voltage threshold, the second pulse signal is respectively at the third state and the 4th state.This method also includes being calculated according to ratio Method detects the situation of three-phase electricity.It is operated than value-based algorithm according at least one of following aspects：First pulse signal and Phase difference and the first pulse between the relativeness of the pulsewidth of two pulse signals, and the first pulse signal and the second pulse signal The relativeness in the cycle of signal or the second pulse signal.
According to another aspect of the disclosure, there is provided a kind of electric system, including the detection according to disclosure one side Device, and control device, wherein, control device is configured as：Testing result in response to indicating particular condition performs corresponding Scheduled operation.Wherein, the three-phase electricity that detection means is detected be from electric system it is one of at different levels from the three-phase electricity that samples.
In one embodiment according to the disclosure, control device can also include frequency converter；Also, frequency converter is configured For the protection mechanism in response to detection triggers itself.
According in another embodiment of the disclosure, control device can also include bypass contactor, and it is in closure Frequency converter is bypassed.
According to another embodiment of the disclosure, fieldbus or channel radio can be passed through between detection means and frequency converter Letter carries out data sharing.
By using the three-phase electricity condition detection apparatus and method according to the disclosure and the motor including the detection means System, the detection method based on voltage of low cost can be used, is examined exactly in the even electric system with frequency converter The phase shortage of three-phase electricity, the situation such as anti-phase are measured, so that protection properly and timely is provided motor.
Brief description of the drawings
With reference to the explanation of embodiment of the disclosure, can be more readily understood that below in conjunction with the accompanying drawings the disclosure more than and Other objects, features and advantages.In the accompanying drawings, identical or corresponding technical characteristic or part will use identical or corresponding attached Icon is remembered to represent.The size and relative position of unit need not be drawn out according to ratio in the accompanying drawings.
Fig. 1 is to illustrate the structured flowchart for being used to detect the detection means of the situation of three-phase electricity according to the embodiment of the present disclosure.
Fig. 2 a are the exemplary circuit diagrams for showing the pulse generation circuit according to the embodiment of the present disclosure.
Fig. 2 b are the waveforms for the two pulse signals and phase relation between them for illustrating pulse generation circuit generation Figure.
Fig. 3 is the value and the schematic diagram of the corresponding relation of three-phase electricity situation for illustrating peak pulse duration and mutually all ratios.
Fig. 4 is the structured flowchart for illustrating the detection means according to the disclosure another embodiment.
Fig. 5 is to illustrate the flow chart for being used to detect the detection method of the situation of three-phase electricity according to the embodiment of the present disclosure.
Fig. 6 is the state diagram for illustrating the low frequency detection algorithm according to the embodiment of the present disclosure.
Fig. 7 is the flow chart for illustrating the detection carried out according to the detection unit of the embodiment of the present disclosure.
Fig. 8 is the block diagram for the structure for illustrating the electric system according to the embodiment of the present disclosure.
Fig. 9 is the circuit diagram for schematically showing the electric system using the detection means according to the embodiment of the present disclosure.
Figure 10 is the circuit diagram for schematically showing the electric system using the detection means according to the embodiment of the present disclosure.
Figure 11 is the circuit diagram for schematically showing the electric system using the detection means according to the embodiment of the present disclosure.
Embodiment
Illustrate embodiment of the disclosure with reference to the accompanying drawings.It should be noted that for purposes of clarity, in accompanying drawing and explanation Eliminate the expression and description of part unrelated with the disclosure, well known by persons skilled in the art and processing.
It will be understood to those skilled in the art that the processing of each aspect of the present invention or function may be implemented as completely firmly Part embodiment, or the embodiment of integration software part and hardware components.These processing or function can be usually in this paper Referred to as " circuit ", " module " or " system ".For example, the comparison for two physical quantitys, can be compared by analog circuit, Compared by logic circuit after digital value can also be sampled as, or compare by way of computing device compares instruction Compared with.The embodiment of each processing or function can be determined according to the factor of performance, cost etc. in specific implementation.
Fig. 1 is to illustrate the structural frames for being used to detect the detection means 100 of the situation of three-phase electricity according to the embodiment of the present disclosure Figure.Detection means 100 includes pulse generation circuit 101 and detection unit 102.
Pulse generation circuit 101 is configured as according to alternate the first line voltage generation the of the first phase of three-phase electricity and second One pulse signal, and the second pulse signal is generated according to the second alternate line voltage of the third phase of three-phase electricity and second, wherein When the first line voltage is respectively to be higher or lower than predetermined voltage threshold, the first pulse signal is respectively at first state and second State, when the second line voltage is respectively to be higher or lower than predetermined voltage threshold, the second pulse signal is respectively at the third state With the 4th state.It is assumed that in the present embodiment, three-phase electricity at three-phase input U, V, the W of detection means 100 to machine winding Situation is detected, then pulse generation circuit 101 can be respectively according to the line electricity between U phases and V phases and between W phases and V phases Pressure two pulse signals of generation.Above-mentioned predetermined voltage threshold can determine according to the specific design scheme of circuit.Pulse signal Different conditions, such as the first and second states and the third and fourth state, respectively represent pulse signal high and low level.
The exemplary circuit diagram of pulse generation circuit 101 according to disclosure one embodiment is shown in Fig. 2 a.In the reality Apply in example, pulse generation circuit is realized using photoelectrical coupler.Specifically, when the line voltage between U phases and V phases for just and its When absolute value reaches the luminous voltage for exciting photoelectrical coupler luminous, photoelectrical coupler lights.The reception side joint of photoelectrical coupler The light sent by emission side is received, and is filled and changes electric signal output into.Although and when the line voltage between U phases and V phases to be negative or For just but when its absolute value is less than luminous voltage, the emission side of photoelectrical coupler does not light.In this case, photoelectrical coupler Output end output voltage be 0V.So as to generate the corresponding pulse P1 of line voltage between U phases and V phases.Similarly, Can be according to the line voltage generation pulse P2 between W phases and V phases.
In Fig. 2 a embodiment, for the luminous of the predetermined voltage threshold compared with line voltage and photoelectrical coupler Voltage is related.In addition, the connection of the input pin of photoelectrical coupler is not limited to the mode shown in Fig. 2 a.For example, it can incite somebody to action The input pin reversal connection of at least one of two photoelectrical couplers.Specifically, for example, U can be connected into photoelectrical coupler Negative pole and V is connected to the positive pole of photoelectrical coupler.The change of this connection does not interfere with generated pulse signal at this Availability in disclosed scheme.
Although bring the advantages that input signal is isolated with output signal, using up shown in Fig. 2 a using photoelectrical coupler Electric coupler realizes that the scheme of pulse generation circuit is exemplary.According to the realization side of the pulse generation circuit of the disclosure Formula not limited to this, as long as the relation between line voltage and predetermined voltage threshold can be reflected.
Fig. 2 b are the oscillograms for illustrating pulse signal P1 and P2 and the phase relation between them.T1 and T2 are represented respectively Pulse signal P1 and P2 cycle；WP1And WP2Pulse signal P1 and P2 pulsewidth are represented respectively；And PD represent pulse signal P1 and Phase difference between P2.
In a known method, generated pulse signal P1 and P2 pulsewidth W can be directly usedP1And WP2With PD is differed to determine the situation of detected three-phase electricity.For example, as shown in Table 1 below：
Table 1
Situation It is determined that foundation（When three-phase electricity frequency is 50Hz）
Normally PD+(WP2-WP1)/2=13.3ms
U phase phase shortages P1 is not present, and P2 is present
V phase phase shortages PD+(WP2-WP1)/2=10ms
W phase phase shortages P1 is present, and P2 is not present
It is anti-phase PD+(WP2-WP1)/2=6.7ms
Phase shortage and the short circuit of one of institute's phase shortage and other two-phase PD+(WP2-WP1)/2=0 or 10ms
However, when the frequency of the three-phase electricity detected changes, such as three-phase electricity in the output end to frequency converter In the case of being detected, the difference between the pulsewidth of each pulse signal and pulse can change.In other words, when being examined When the frequency of the three-phase electricity of survey changes, being directly no longer applicable using the method for pulsewidth and difference illustrated in table 1.
In view of problem above, the first purpose of the disclosure is：A kind of frequency even in three-phase electricity is provided to change In the case of detected, such as the three-phase electricity of inverter output terminal is detected, three-phase electricity can also be detected exactly Normal, phase shortage, detection means, detection method and the department of electrical engineering using the detection means and detection method of the situation such as anti-phase System.
Fig. 1 is returned, is configured as detecting three-phase electricity according to than value-based algorithm according to the detection unit 102 of the embodiment of the present disclosure Situation.It is operated than value-based algorithm according at least one of following aspects：First pulse signal P1 and the second pulse signal P2 Pulsewidth WP1And WP2Relativeness；And the first phase difference PD and between pulse signal P1 and the second pulse signal P2 The cycle T 1 of one pulse signal or the second pulse signal, T2Relativeness.In theory, the first pulse signal or the second pulse letter Number cycle T1、T2It is equal, and equal to the cycle T for detecting three-phase electricity.How the frequency of the three-phase electricity no matter detected changes, Pulsewidth WP1And WP2Relativeness and phase difference PD and cycle T1Or T2Relativeness keep it is constant, therefore, it is possible to be used for The situation of the three-phase electricity of frequency change is detected.
In one embodiment, for example, the relativeness of pulsewidth can be characterized by peak pulse duration.Peak pulse duration can be WP1/WP2Or WP2/WP1.Phase difference and the relativeness in cycle can pass through mutually all ratios, i.e. phase difference PD and the first pulse signal Or second pulse signal cycle（For convenience, represented here with T）Ratio PD/T characterize.Due to peak pulse duration and mutually all ratios Do not influenceed, thus gone in the case of frequency conversion to the situation of detected three-phase electricity by the change of detected three-phase electricity frequency Determination.
Fig. 3 is the value and the schematic diagram of the corresponding relation of three-phase electricity situation for illustrating peak pulse duration and mutually all ratios.Detection unit Used in 102 for example this corresponding relation is based on than value-based algorithm.In figure 3, transverse axis represents peak pulse duration, such as WP1/WP2Or WP2/WP1；The longitudinal axis represents mutually all ratios, i.e. PD/T.According to than value-based algorithm, such as shown in Figure 3, when pulse generation circuit generates Pulse P1 and P2 peak pulse duration when being less than first threshold Th1, detection unit 102 can determine that the situation of three-phase electricity is in single-phase Phase shortage situation.Specifically, when pulse P1 is based on the line voltage generation between U phases and V phases, and pulse P2 be based on W phases and V phases it Between line voltage generation, and when pulse P1 and P2 peak pulse duration are less than first threshold Th1, according to than value-based algorithm, detection unit 102 The U phases or W phase phase shortages in three-phase electricity can be determined.
, can be according to pulse P1 and P2 phase week ratio according to than value-based algorithm when peak pulse duration is more than or equal to first threshold Th1 The section fallen into determines the situation of three-phase electricity.Mutually week from 0 than being worth to its maximum by Second Threshold Th2, the 5th threshold value Th5, the 6th threshold value Th6, the 3rd threshold value Th3 and the 4th threshold value Th4（Listed with order from small to large）Some sections are divided. Different sections corresponds to different three-phase electricity situations.Specifically, as shown in figure 3, when all ratios of phase are fallen into（0, Th2）Or（Th3, Th4）When middle, three-phase electric power open phase can be determined according to than value-based algorithm, detection unit.More specifically, when pulse P1 be based on U phases and Line voltage generation between V phases, and pulse P2 is generated based on the line voltage between W phases and V phases, and mutually all ratios are fallen into（0, Th2） Or（Th3, Th4）When middle, detection unit 102 can according to than value-based algorithm determine three-phase electric power open phase or phase shortage and institute's phase shortage with The short circuit of one of other two-phase.In addition, when peak pulse duration is more than or equal to first threshold Th1, and mutually all ratios are fallen into（Th5, Th6）When middle, Detection unit 102 can be anti-phase according to determining that three-phase electricity is present than value-based algorithm.And when peak pulse duration is more than or equal to first threshold Th1, And mutually week than falling into outside above-mentioned each scope, specifically, falls into（Th2, Th5）Or（Th6, Th3）Or（Th4, maximum）When, inspection Surveying unit 102 can determine that three-phase electricity is in normal condition according to than value-based algorithm.
In general, threshold value Th2 to Th6 value can be determined by the relativeness of three-phase electricity.For example, in certain tool In the connection of body circuit, one of pulse P1 and P2 theoretical value of difference obtained during three-phase electricity normal work is 240 °.Then may be used By centered on the time value corresponding to 240 ° and the ratio of pulse period, with according to real pulse shape rising edge, reality The error of the determination such as circuit parameter and load state is width, it is determined that the phase week corresponding with three-phase electricity normal operative condition compares model Enclose, and then the boundary value of the scope is defined as corresponding threshold value.The determination of other threshold values is by that analogy.Threshold value Th1 can lead to Cross and change the multiple test of test condition to determine.Changing test condition is, for example,：Connect different frequency converters, connection or not Connect motor, the working frequency point for changing frequency converter, the different types of failure of emulation etc..
Detection unit 102 can be realized for example with MCU.Specifically, by MCU Lai complete paired pulse new P1 and P2 frequency The measurement of the parameters such as rate, cycle, pulsewidth, difference.Then, by MCU by write it is therein than value-based algorithm come to three-phase electricity situation It is determined.However, the not limited to this of detection unit 102 according to the embodiment of the present disclosure.Electricity can also be such as counted by building The digital circuits such as road, comparison circuit complete various measurements described above and compare value-based algorithm.
Incidentally, it is contemplated that the pulse signal that pulse generation circuit 101 is generated is probably undesirable.For example, band It is jagged.So as to influence the accuracy in detection of detection unit 102, or even influence the service life of detection unit 102.In some realities Apply in example, filter circuit can be set between pulse generation circuit 101 and detection unit 102, to believe the pulse generated Number it is filtered.In addition, as needed, detection means 100 can also include notification unit, for output and testing result Corresponding signal.Fig. 4 is the structured flowchart for illustrating the detection means 400 according to the disclosure another embodiment.Except pulse is given birth to Into outside circuit 101 and detection unit 102, detection means 400 can also include filter circuit 403 and notification unit 404.
Fig. 5 is to illustrate the flow chart for being used to detect the detection method of the situation of three-phase electricity according to the embodiment of the present disclosure. In S501, according to the first alternate line voltage of the first phase of three-phase electricity and second（Line voltage between such as U phases and V phases）Generation First pulse signal P1, and according to the second alternate line voltage of the third phase of three-phase electricity and second（Between such as W phases and V phases Line voltage）Generate the second pulse signal P2.Wherein, when the first line voltage is respectively to be higher or lower than predetermined voltage threshold（It is all Such as the luminous voltage of photoelectrical coupler）When, the first pulse signal P1 is respectively at first state and the second state（Different states The low and high level of pulse signal is represented respectively）, when the second line voltage is respectively to be higher or lower than the predetermined voltage threshold, second Pulse signal P2 is respectively at the third state and the 4th state.
In S502, the situation of three-phase electricity is detected according to than value-based algorithm.Than value-based algorithm according to following aspects at least it One work：The relativeness of the pulsewidth of first pulse signal and the second pulse signal, and the first pulse signal and the second pulse letter The relativeness of phase difference and the cycle of the first pulse signal or the second pulse signal between number.Above reduced value is calculated Method is described in detail, and is not repeated herein and is described.
Currently marketed most of frequency converters all use the scalar control method of motor, such as electric voltage frequency（V/F）It is permanent Fixed control method.For these frequency converters, during the raising frequency of its last longer and frequency reducing, its output voltage also with The reduction of frequency and be proportionally reduced.The reduction of voltage is particularly bright at the initial stage of raising frequency process and the later stage of frequency reducing process It is aobvious.Inverter output terminal three-phase electricity situation in variable-frequency motor system is being detected using the detection means according to the embodiment of the present disclosure In the case of, above-mentioned voltage, which reduces, may be such that testing result inaccuracy.For example, when the pulse generation circuit of detection means makes During with photoelectrical coupler to realize, with the reduction of frequency converter output voltage, the line voltage between each phase also diminishes therewith, even Less than the luminous voltage required for exciting photoelectrical coupler to light.In this case, the shape of three-phase electricity can not accurately be detected Condition.
In order to solve the above problems, can further improve being done according to the detection means of the disclosure.For example, increase is used In the low frequency testing mechanism of detection low frequency three-phase electricity.
Fig. 6 is the state diagram for illustrating the low frequency detection algorithm according to the embodiment of the present disclosure.Due to pulse signal P1 and P2 Frequency can reflect the frequency of detected three-phase electricity, more specifically, pulse signal P1 and P2 frequency are equal to what is detected The frequency of three-phase electricity, it is possible to determine whether to calculate using low frequency detection by determining pulse signal P1 and P2 frequency range Method.When pulse signal P1 and P2 frequency are less than frequency threshold, it is determined that the three-phase electricity detected is in low frequency, can use low Frequency detection algorithm detects to it.
Frequency threshold can be determined by being tested.For example, using high frequency algorithm, i.e., than value-based algorithm, to having built Good electric system carries out three-phase electricity condition detection.When it is relatively low due to frequency and when error detection occurs, error detection occurs for record Frequency values.Then can be for example by the way that the frequency values recorded be determined into frequency threshold plus certain surplus.Pass through reality for example, working as The property tested detects, and the probability for finding that error detection occurs when frequency values are less than 10Hz dramatically increases, then 10Hz can be used to add one Surplus is determined to calculate frequency threshold.When surplus is 15Hz, frequency threshold is 25Hz.
In the system of other including frequency converter, the frequency of the three-phase electricity of inverter output terminal less than it is a certain close to During 0 lower frequency limit, the output voltage of frequency converter becomes too low.In this case, when the frequency of the output of frequency converter is less than During the lower frequency limit, it is believed that frequency converter is closed.Thus, frequency threshold only is less than to frequency and is more than the three-phase of lower frequency limit Electricity is detected using low frequency detection algorithm.Lower frequency limit is different and different according to electric system, such as can be 2Hz.
As shown in fig. 6, in low frequency detection algorithm, the pulsewidth WP1 and WP2 of pulse signal is entered with predetermined pulse width threshold Row compares.Pulse width threshold can determine according to the design needs.
For example, in one embodiment, the frequency in the range of 2Hz to 25Hz can be considered as low frequency.That is, in the embodiment In, the minimum frequency of pulse signal is 2Hz, then the maximum cycle length of pulse signal is 500ms.Understood according to analysis, three In the case that mutually electric frequency changes, high level and the maximum cycle of the pulse signal that the three-phase electricity of normal condition is generated are grown The ratio of degree exists（1/3,1/2）Between change.Therefore, it is possible to counted by choosing ratio less than 1/3, to represent unusual condition Calculate pulse width threshold.For example, in the embodiment shown in fig. 6, pulse width threshold value is 125ms（500ms*1/4）.
As shown in fig. 6, when the pulsewidth of pulse signal is less than predetermined pulse width threshold value, it is believed that the pulse signal is invalid.Work as arteries and veins When rushing the pulsewidth of signal and being more than or equal to predetermined pulse width threshold value, it is believed that the pulse signal is effective.
As shown in fig. 6, when two pulse signals are all invalid, the situation of three-phase electricity points to " normal switching-off "（Arrow " 1 "）. For example, in the case where being detected to the three-phase electricity of the output end of frequency converter, when two pulse signals are all invalid, it is determined that becoming Frequency device does not start.
Specifically, in one embodiment, detection unit can be configured as being both less than in the frequency of two pulse signals Preset frequency threshold value, and when the pulsewidth of two pulse signals is both less than pulse width threshold, determine that three-phase is electrically turn off.
As shown in fig. 6, when one of two pulse signals are invalid, and another is effective, the situation of three-phase electricity, which is pointed to, " to be lacked Phase "（Arrow " 2 " and 3）.Specifically, for example, detection unit can be configured as being both less than frequency in the frequency of two pulse signals Rate threshold value, and the pulsewidth of one of two pulse signals is less than pulse threshold and another pulsewidth is more than or equal to pulse width threshold When, the situation for determining three-phase electricity is single-phase electricity phase shortage.
When two pulse signals are all effective, the situation of three-phase electricity needs further to be determined with than value-based algorithm（Arrow “4”）.Specifically, for example, detection unit is configured to be both less than frequency threshold in the frequency of two pulse signals, And the pulsewidth of two pulse signals is both greater than when being equal to pulse width threshold, further examined according to described above than value-based algorithm Survey.
After the situation detection result of three-phase electricity is obtained, if detecting that three-phase electricity is in normal condition, department of electrical engineering System continues normal work；If detecting that three-phase electricity is in the abnormal situation such as phase shortage, anti-phase, system enters alarm, disconnected Contactor, close the electric motor protecting states such as frequency converter.
Describing than value-based algorithm and after being preferred for the low frequency detection algorithm of low frequency three-phase electricity, coming with reference to Fig. 7 Description carries out the preferred embodiment of detection process according to the detection unit 102 of the disclosure.
Fig. 7 is the flow chart for illustrating the detection carried out according to the detection unit 102 of the embodiment of the present disclosure.In step S701 In, detection unit 102 obtains the pulse signal P1 and P2 that are generated by pulse generation circuit 101 cycle, frequency, difference and arteries and veins Width, in case subsequent treatment uses.
In step S702, whether the three-phase electricity that detection unit 102 determines detecting belongs to low frequency.For example, detection is single Member 102 by pulse signal P1 and P2 frequency compared with frequency threshold, when it is determined that the frequency of two pulse signals is both less than During frequency threshold, the three-phase electricity for determining detecting in step S702 belongs to low frequency（It is "Yes" in step S702）.Now, carry out To step S703.And when detection unit 102 is not both less than frequency threshold by the frequency for comparing two pulse signals of determination, It is determined that the three-phase electricity detected is not belonging to low frequency（It is "No" in step S702）, proceed to step S704.
Further, optionally, in step S702, except whether the frequency of two pulse signals is both less than into frequency threshold As determine three-phase electricity whether belong to outside the condition of low frequency, lower-frequency limit can also be considered simultaneously, the lower-frequency limit close to 0Hz, e.g. 2Hz.When the frequency of two pulse signals is below lower-frequency limit, three detected are determined in step S702 Phase electricity is not belonging to low frequency（It is "No" in step S702）.Step proceeds to step S704.In other words, lower-frequency limit is being considered In embodiment, only two pulses P1 and P2 frequency is both less than frequency threshold, and at least one be not less than lower-frequency limit, just will Three-phase electricity is determined to belong to low frequency.
In step S703, low frequency detection process is performed using the low frequency detection algorithm for combining Fig. 6 descriptions.Here weight is omitted Multiple description.
In step S704, whether can be more than frequency threshold by determining the frequency of one of two pulse signals, come true Whether fixed detected three-phase electricity is high frequency three-phase electricity.
For example, when the frequency of one of two pulse signals is more than frequency threshold（Such as 25Hz）When, it is believed that three detected Phase electricity is high frequency three-phase electricity.At this moment, it is "Yes" in step S704, proceeds to step S705.In step S705, according to retouching above The ratio algorithm performs high-frequency detection processing stated.
After the detection to the situation of three-phase electricity is completed in step S703 or step S705, proceed to step S706.System Normal operation in the case of system is normally in testing result, and when testing result is the fault state such as phase shortage, anti-phase, into electricity Machine guard mode.Electric motor protecting state is, for example,：System is alarmed by sound or light flash, cuts off three-phase contactor or pass Close frequency converter etc..
When being defined as "No" in step S704, it means that it is determined that the detection algorithm for high frequency had not both been applied to, The inapplicable detection algorithm for low frequency, three-phase electricity is not detected then, step is directly to step S706.For example, When pulse frequency is close to 0（It is, for example, less than 2Hz）When, it is believed that three-phase electricity is in normal turn-off state（For example, when to frequency converter When output is detected, it is believed that frequency converter is closed）, then step proceed to step S706, keep system mode, do not take any guarantor Shield measure.Or for example, when the frequency of one of two pulse signals is more than predetermined upper frequency limit（Such as 80Hz）When, also not Three-phase electricity is detected, but continue to use last time testing result, with step S706 keep system normal operation or Person continues to take safeguard measure.
Alternatively, in the case of it is assumed that frequency is in the low frequency or high-frequency range expected, step S702 can also be omitted Judgement with S704 and directly carry out step S703 or S705 corresponding detection and subsequent treatment.
Various electric systems can be used for according to the detection means of the embodiment of the present disclosure, for detecting the electric system at least The three-phase electricity at places one of at different levels, timely protected with providing motor.Fig. 8 is to illustrate the electric system according to the embodiment of the present disclosure The block diagram of 800 structure.In fig. 8, for the protrusion content to be described, other dresses such as motor in electric system are eliminated Put.Electric system 800 is in addition to including the detection means 801 according to the disclosure, in addition to control device 802.Control device 802 can be configured to respond to indicate that the testing result of particular condition performs corresponding scheduled operation.The testing result can be with It is the signal for the situation that the instruction exported from detection means 801 is detected.The three-phase electricity that detection means 801 is detected is from motor The three-phase electricity of the place's samplings one of at different levels of system 800.
The electric system using the detection means according to the embodiment of the present disclosure is described with reference to Fig. 9 to Figure 11.It please note Meaning：In order to simplify accompanying drawing, Fig. 9 omits the power supply drawn to detection means into Figure 11.Fig. 9 is to schematically show use according to this The circuit diagram of the electric system 900 of the detection means 901 of open embodiment.In electric system 900, three phase mains passes through respectively Phase line L1, L2, L3 are powered to three-phase input end U, V, W of motor.It is provided between three phase mains and motor for controlling The three-phase contactor of three-phase electricity break-make processed.In the present embodiment, three-phase contactor is the example of the specific implementation of control device.Inspection Survey device 901 to detect the three-phase electricity of the input of motor, and the detection of instruction particular condition is notified to three-phase contactor As a result.Testing result in response to indicating particular condition, three-phase contactor are remained closed or disconnected.
The electric system that according to the detection means of the embodiment of the present disclosure can be used for that there is frequency converter.Figure 10 is schematic It is shown with the circuit diagram of the electric system 1000 of the detection means 1001 according to the embodiment of the present disclosure.Electric system 1000 includes Frequency converter 1002.Although in the embodiment in figure 10, detection means 1001 to input end of motor at（That is, inverter output terminal Place）Three-phase electricity detected, but disclosure not limited to this can also be examined to the three-phase electricity at electric system any level Survey.For example, detection means 1001 to three phase mains and can be arranged between its three-phase contactor between frequency converter 1002 Three-phase electricity detected.When being disposed with three-phase contactor between the output end of frequency converter 1002 and input end of motor（In figure It is not shown）When, for example, it is also possible to be detected to the three-phase electricity situation of the three-phase contactor upstream or downstream.
Compared with the embodiment shown in Fig. 9, in the embodiment shown in fig. 10, detection means 1001 does not directly tie detection Fruit is supplied to three-phase contactor.Instead, testing result is supplied to frequency converter by detection means 1001.By frequency converter in response to connecing The protection mechanism of the detection triggers itself of the instruction particular condition received, carries out electric motor protecting.It can be seen that in the present embodiment In, frequency converter is implemented as the example of control device.Selectively, detection means 1001 can also be configured as instruction is different The testing result of situation is selectively provided to frequency converter 1002 or three-phase contactor.
The protection mechanism of frequency converter itself can include：Stop the three-phase electricity output of itself, cut off three-phase trigger, triggering Warning device of buzzing or light flash etc..
Make detection means 1001 that testing result is supplied into frequency converter, and make inspection of the frequency converter in response to instruction particular condition The scheme for surveying result triggering autoprotection mechanism takes full advantage of the existing capability of frequency converter.In addition, with directly by detection means Cut-out three-phase contactor is compared, and will not be forced to power off in frequency converter, be saved the time of frequency converter dump and restart.
However, in some electric systems, even if there is unusual condition in three-phase electricity, it is also desirable to which motor remains on.Or Person, in some cases, when three-phase electricity occurs abnormal, it is certain position on frequency converter failure or current line that can be diagnosed to be Put caused by open circuit.In the case of similar to these, bypass contactor can be set, by power supply three-phase electricity and electrode input It is directly connected to, maintains the operation of motor.
Figure 11 is the electricity for schematically showing the electric system 1100 using the detection means 1101 according to the embodiment of the present disclosure Lu Tu.Electric system 1100 is in addition to including detection means 1101 and frequency converter 1102, in addition to bypass contactor 1103.It is other Road contactor 1103 closure when can by frequency converter 1102, or, selectively, can will be arranged in frequency converter 1102 simultaneously The three-phase contactor bypass of upstream and downstream.Therefore, the 1103 of bypass contactor are arranged such that when frequency converter breaks down or works as When the failures such as open circuit occur for certain position on preceding working line, motor can be kept by bypass frequency conversion device or faulty line Operation.In the embodiment shown in fig. 11, testing result can be supplied to frequency converter 1102, bypass contact by detection means 1101 Device 1103 is arranged in three-phase contactor of the upstream and downstream of frequency converter 1102 etc., corresponding predetermined so as to be performed according to testing result Operation.
Here, when testing result is supplied to frequency converter 1102 by detection means 1101, frequency converter 1102 can be in response to The protection mechanism of the detection triggers itself of the instruction particular condition received, carries out electric motor protecting.This combined Figure 10 It is described, repeats no more here.
Similar to embodiment illustrated in fig. 10, detection means 1101 can be examined to the three-phase electricity at electric system any level Survey.For example, detection means 1101 can be to input end of motor at（Or at inverter output terminal）Three-phase electricity detected, it is or right Three-phase electricity at three phase mains is detected, etc..
In addition, fieldbus can also be passed through between detection means and frequency converter（Such as 485 buses）Or radio communication number According to progress data sharing.The data shared for example including：Frequency, cycle, the detected situation of three-phase electricity, or detection The data such as the frequency of the pulse that device is generated, cycle, difference, peak pulse duration, etc..
In specification above the disclosure is described with reference to specific embodiment.But one of ordinary skill in the art's energy It is enough to understand：Various modifications and variations can be carried out on the premise of the scope of the present disclosure limited without departing from such as claims.

Claims (80)

1. a kind of three-phase electricity condition detection apparatus, including：
Pulse generation circuit, it is configured as according to alternate the first line voltage generation first of the first phase of the three-phase electricity and second Pulse signal, and the second pulse signal is generated according to the second alternate line voltage of the third phase of the three-phase electricity and second, its In when first line voltage be respectively be higher or lower than predetermined voltage threshold when, first pulse signal is respectively at first State and the second state, when second line voltage is respectively to be higher or lower than the predetermined voltage threshold, second arteries and veins Rush signal and be respectively at the third state and the 4th state；And
Detection unit, be configured as according to detecting the situation of the three-phase electricity than value-based algorithm, it is described than value-based algorithm according to following At least one of aspect works：
The relativeness of the pulsewidth of first pulse signal and second pulse signal, and
Phase difference between first pulse signal and second pulse signal and first pulse signal or described the The relativeness in the cycle of two pulse signals.
2. detection means according to claim 1, wherein, the relativeness of the pulsewidth is characterized by peak pulse duration.
3. detection means according to claim 1, wherein, the phase difference and the relativeness in the cycle pass through mutually week Than that is, described phase difference characterizes with first pulse signal or the ratio in the cycle of second pulse signal.
4. detection means according to claim 3, wherein, the relativeness of the pulsewidth is characterized by peak pulse duration.
5. detection means according to claim 4, wherein, the detection unit is configured to：Described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins The pulsewidth of signal is rushed both greater than when being equal to pulse width threshold, the detection is carried out than value-based algorithm according to described.
6. detection means according to claim 4, wherein, according to described than value-based algorithm, when the peak pulse duration is less than first During threshold value Th1, the detection unit determines the first phase or third phase phase shortage in the three-phase electricity.
7. detection means according to claim 5, wherein, according to described than value-based algorithm, when the peak pulse duration is less than first During threshold value Th1, the detection unit determines the first phase or third phase phase shortage in the three-phase electricity.
8. the detection means according to any one of claim 4 to 7, wherein, according to described than value-based algorithm, when the pulsewidth Than more than or equal to first threshold Th1, and phase week is than when falling into (0, Th2) or (Th3, Th4), the detection unit determines The three-phase electric power open phase, wherein Th2, Th3 and Th4 are second, third and the 4th threshold value respectively, wherein, 0<Th2<Th3<Th4.
9. the detection means according to any one of claim 4 to 7, wherein, according to described than value-based algorithm, when the pulsewidth Than more than or equal to first threshold Th1, and phase week is than when falling into (Th5, Th6), the detection unit determines the three-phase Electricity exist it is anti-phase, wherein, Th5 and Th6 are the 5th threshold value and the 6th threshold value, wherein, Th2<Th5<Th6<Th3.
10. detection means according to claim 8, wherein, according to described than value-based algorithm, when the peak pulse duration is more than or equal to First threshold Th1, and the phase is all than when falling into (Th5, Th6), it is anti-phase that the detection unit determines that the three-phase electricity is present, Wherein, Th5 and Th6 is the 5th threshold value and the 6th threshold value, wherein, Th2<Th5<Th6<Th3.
11. the detection means according to any one of claim 4 to 7, wherein, according to described than value-based algorithm, when the arteries and veins Wide ratio is more than or equal to first threshold Th1, and when the phase week is than falling into other scopes, the detection unit determines the three-phase The situation of electricity is normal.
12. detection means according to claim 8, wherein, according to described than value-based algorithm, when the peak pulse duration is more than or equal to First threshold Th1, and when the phase week is than falling into other scopes, the detection unit determines the situation of the three-phase electricity for just Often.
13. detection means according to claim 9, wherein, according to described than value-based algorithm, when the peak pulse duration is more than or equal to First threshold Th1, and when the phase week is than falling into other scopes, the detection unit determines the situation of the three-phase electricity for just Often.
14. detection means according to claim 10, wherein, according to described than value-based algorithm, when the peak pulse duration is more than etc. In first threshold Th1, and when the phase week is than falling into other scopes, the detection unit determines that the situation of the three-phase electricity is Normally.
15. the detection means according to any one of claim 4 to 7, wherein, the detection unit is configured to Be less than frequency threshold in the frequency of first pulse signal and second pulse signal, and first pulse signal and When the pulsewidth of second pulse signal is both less than pulse width threshold, determine that the three-phase is electrically turn off.
16. detection means according to claim 8, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
17. detection means according to claim 9, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
18. detection means according to claim 10, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
19. detection means according to claim 11, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
20. detection means according to claim 12, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
21. detection means according to claim 13, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
22. detection means according to claim 14, wherein, the detection unit is configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of signal and being both less than pulse width threshold, determine that the three-phase is electrically turn off.
23. the detection means according to any one of claim 4 to 7, wherein, the detection unit is further configured to Be less than frequency threshold in the frequency of first pulse signal and second pulse signal, and first pulse signal and When the pulsewidth of one of second pulse signal is less than pulse width threshold and another pulsewidth and is more than or equal to pulse width threshold, institute is determined The situation for stating three-phase electricity is single-phase electricity phase shortage.
24. detection means according to claim 8, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
25. detection means according to claim 9, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
26. detection means according to claim 10, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
27. detection means according to claim 11, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
28. detection means according to claim 12, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
29. detection means according to claim 13, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
30. detection means according to claim 14, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
31. detection means according to claim 15, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
32. detection means according to claim 16, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
33. detection means according to claim 17, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
34. detection means according to claim 18, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
35. detection means according to claim 19, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
36. detection means according to claim 20, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
37. detection means according to claim 21, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
38. detection means according to claim 22, wherein, the detection unit is further configured to described first The frequency of pulse signal and second pulse signal is less than frequency threshold, and first pulse signal and second arteries and veins When rushing the pulsewidth of one of signal and being less than pulse width threshold and another pulsewidth and be more than or equal to pulse width threshold, the three-phase electricity is determined Situation is single-phase electricity phase shortage.
39. a kind of detection method for being used to detect the situation of three-phase electricity, including：
First pulse signal is generated according to the first alternate line voltage of the first phase of the three-phase electricity and second, and according to described The third phase of three-phase electricity and second the second alternate line voltage generate the second pulse signal, wherein when first line voltage is distinguished During for higher or lower than predetermined voltage threshold, first pulse signal is respectively at first state and the second state, when described Second line voltage is respectively that second pulse signal is respectively at the third state when being higher or lower than the predetermined voltage threshold With the 4th state；And
According to detecting the situation of the three-phase electricity than value-based algorithm, it is described than value-based algorithm according at least one of following aspects work Make：
The relativeness of the pulsewidth of first pulse signal and second pulse signal, and
Phase difference between first pulse signal and second pulse signal and first pulse signal or described the The relativeness in the cycle of two pulse signals.
40. the detection method according to claim 39, wherein, the relativeness of the pulsewidth is characterized by peak pulse duration.
41. the detection method according to claim 39, wherein, the relativeness in the phase difference and the cycle passes through phase All ratios, i.e., described phase difference characterize with first pulse signal or the ratio in the cycle of second pulse signal.
42. detection method according to claim 41, wherein, the relativeness of the pulsewidth is characterized by peak pulse duration.
43. detection method according to claim 42, wherein, in first pulse signal and second pulse signal Frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both greater than equal to pulsewidth During threshold value, the detection is carried out than value-based algorithm according to described.
44. detection method according to claim 42, wherein, according to described than value-based algorithm, when the peak pulse duration is less than the During one threshold value Th1, the first phase or third phase phase shortage in the three-phase electricity are determined.
45. detection method according to claim 43, wherein, according to described than value-based algorithm, when the peak pulse duration is less than the During one threshold value Th1, the first phase or third phase phase shortage in the three-phase electricity are determined.
46. the detection method according to any one of claim 42 to 45, wherein, according to described than value-based algorithm, when described Peak pulse duration is more than or equal to first threshold Th1, and the phase is all than when falling into (0, Th2) or (Th3, Th4), determining the three-phase Electric phase shortage, wherein Th2, Th3 and Th4 are second, third and the 4th threshold value respectively, wherein, 0<Th2<Th3<Th4.
47. the detection method according to any one of claim 42 to 45, wherein, according to described than value-based algorithm, when described Peak pulse duration is more than or equal to first threshold Th1, and phase week is than when falling into (Th5, Th6), determining that the three-phase electricity is present instead Phase, wherein, Th5 and Th6 are the 5th threshold value and the 6th threshold value, wherein, Th2<Th5<Th6<Th3.
48. detection method according to claim 46, wherein, according to described than value-based algorithm, when the peak pulse duration is more than etc. In first threshold Th1, and phase week than when falling into (Th5, Th6), it is anti-phase to determine that the three-phase electricity is present, wherein, Th5 and Th6 is the 5th threshold value and the 6th threshold value, wherein, Th2<Th5<Th6<Th3.
49. the detection method according to any one of claim 42 to 45, wherein, according to described than value-based algorithm, when described Peak pulse duration is more than or equal to first threshold Th1, and when the phase week is than falling into other scopes, the situation for determining the three-phase electricity is Normally.
50. detection method according to claim 46, wherein, according to described than value-based algorithm, when the peak pulse duration is more than etc. In first threshold Th1, and when the phase week is than falling into other scopes, the situation for determining the three-phase electricity is normal.
51. detection method according to claim 47, wherein, according to described than value-based algorithm, when the peak pulse duration is more than etc. In first threshold Th1, and when the phase week is than falling into other scopes, the situation for determining the three-phase electricity is normal.
52. detection method according to claim 48, wherein, according to described than value-based algorithm, when the peak pulse duration is more than etc. In first threshold Th1, and when the phase week is than falling into other scopes, the situation for determining the three-phase electricity is normal.
53. the detection method according to any one of claim 42 to 45, in addition to：In first pulse signal and institute The frequency for stating the second pulse signal is less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal Both less than pulse width threshold when, determine that the three-phase is electrically turn off.
54. detection method according to claim 46, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
55. detection method according to claim 47, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
56. detection method according to claim 48, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
57. detection method according to claim 49, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
58. detection method according to claim 50, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
59. detection method according to claim 51, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
60. detection method according to claim 52, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of first pulse signal and second pulse signal is both less than pulsewidth threshold During value, determine that the three-phase is electrically turn off.
61. the detection method according to any one of claim 42 to 45, in addition to：In first pulse signal and institute The frequency for stating the second pulse signal is less than frequency threshold, and one of first pulse signal and described second pulse signal When pulsewidth is less than pulse width threshold and another pulsewidth and is more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity Phase shortage.
62. detection method according to claim 46, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
63. detection method according to claim 47, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
64. detection method according to claim 48, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
65. detection method according to claim 49, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
66. detection method according to claim 50, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
67. detection method according to claim 51, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
68. detection method according to claim 52, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
69. detection method according to claim 53, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
70. detection method according to claim 54, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
71. detection method according to claim 55, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
72. detection method according to claim 56, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
73. detection method according to claim 57, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
74. detection method according to claim 58, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
75. according to the detection method of claim 59, in addition to：In first pulse signal and second pulse signal Frequency is less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulse width threshold And another pulsewidth, when being more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
76. detection method according to claim 60, in addition to：Believe in first pulse signal and second pulse Number frequency be less than frequency threshold, and the pulsewidth of one of first pulse signal and described second pulse signal is less than pulsewidth When threshold value and another pulsewidth are more than or equal to pulse width threshold, the situation for determining the three-phase electricity is single-phase electricity phase shortage.
77. a kind of electric system, including the detection means according to one of claims 1 to 38, and control device, wherein, The control device is configured as：In response to indicating that the testing result of particular condition performs corresponding scheduled operation,
Wherein, the three-phase electricity that the detection means is detected be from the electric system it is one of at different levels from the three-phase that samples Electricity.
78. the electric system according to claim 77, wherein,
The control device also includes frequency converter；Also,
The frequency converter is configured to respond to the detection triggers protection mechanisms of itself.
79. the electric system according to claim 78, wherein the control device also includes bypass contactor, it is being closed When the frequency converter is bypassed.
80. the electric system according to claim 78 or 79, wherein, can between the detection means and the frequency converter Data sharing is carried out by fieldbus or radio communication.
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